:root{
  --bg:#0b0f14; --bg2:#111821; --card:#151d27; --card2:#1b2531;
  --line:#243040; --text:#e8eef7; --sub:#8fa0b4; --dim:#61708a;
  --brand:#3b82f6; --brand2:#8b5cf6; --orange:#f97316; --gold:#f5b942;
  --red:#ef4444; --green:#22c55e; --radius:16px;
  --shadow:0 10px 30px rgba(0,0,0,.35);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  background:radial-gradient(1200px 600px at 20% -10%,#16233a 0%,transparent 60%),
             radial-gradient(900px 500px at 110% 10%,#1b1230 0%,transparent 55%),
             var(--bg);
  color:var(--text);
  font:14px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  min-height:100vh;
  padding-bottom:76px;
}
a{color:inherit;text-decoration:none}
::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-thumb{background:#2b384b;border-radius:8px}

.topbar{
  position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:14px;
  padding:12px max(14px,env(safe-area-inset-left)) 12px max(14px,env(safe-area-inset-left));
  background:rgba(11,15,20,.86);backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:10px;cursor:pointer;flex:0 0 auto}
.logo{
  width:38px;height:38px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,var(--brand),var(--brand2));
  font-weight:800;font-size:18px;color:#fff;box-shadow:0 6px 18px rgba(59,130,246,.35);
}
.brand-name{font-weight:700;font-size:15px;letter-spacing:.5px}
.brand-sub{font-size:11px;color:var(--sub)}
.searchbar{display:flex;flex:1;max-width:720px;margin:0 auto;background:var(--card);border:1px solid var(--line);border-radius:999px;padding:4px 4px 4px 14px}
.searchbar input{flex:1;background:transparent;border:0;outline:0;color:var(--text);font-size:14px;padding:8px 4px}
.searchbar input::placeholder{color:var(--dim)}
.searchbar button{border:0;border-radius:999px;padding:8px 18px;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;font-weight:600;cursor:pointer}
.top-actions{display:flex;align-items:center;gap:8px;flex:0 0 auto}
.icon-btn{width:38px;height:38px;border-radius:12px;background:var(--card);border:1px solid var(--line);color:var(--text);font-size:17px;cursor:pointer}
.user-chip{border:1px solid var(--line);background:var(--card);color:var(--text);border-radius:999px;padding:8px 14px;font-size:13px;cursor:pointer;max-width:150px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.user-chip.on{border-color:#2f5f9e;color:#cfe3ff}

.tabs{display:flex;gap:6px;padding:10px max(14px,env(safe-area-inset-left));position:sticky;top:63px;z-index:40;background:rgba(11,15,20,.8);backdrop-filter:blur(12px);overflow-x:auto;border-bottom:1px solid var(--line)}
.tabs a{padding:8px 14px;border-radius:999px;color:var(--sub);font-size:13px;white-space:nowrap}
.tabs a.active{background:linear-gradient(135deg,rgba(59,130,246,.22),rgba(139,92,246,.18));color:#fff;border:1px solid #2f4a75}

main{padding:16px max(14px,env(safe-area-inset-left)) 30px}
.section-title{display:flex;align-items:center;justify-content:space-between;margin:18px 0 10px}
.section-title h2{font-size:16px;margin:0;font-weight:700}
.section-title .hint{font-size:12px;color:var(--sub)}

.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.stat{background:linear-gradient(160deg,var(--card2),var(--card));border:1px solid var(--line);border-radius:var(--radius);padding:14px}
.stat b{display:block;font-size:20px;font-weight:800;letter-spacing:.3px}
.stat span{font-size:12px;color:var(--sub)}
.stat .delta{font-size:11px;color:var(--green);margin-top:2px}

.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:12px}
.card{background:linear-gradient(170deg,var(--card2),var(--card));border:1px solid var(--line);border-radius:var(--radius);padding:14px;display:flex;flex-direction:column;gap:8px;cursor:pointer;transition:.18s transform,.18s border-color}
.card:hover{transform:translateY(-2px);border-color:#35507a}
.card h3{margin:0;font-size:15px;font-weight:700;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card .desc{font-size:12px;color:var(--sub);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:34px}
.card .meta{display:flex;align-items:center;gap:8px;font-size:11px;color:var(--dim)}
.card .meta img{width:20px;height:20px;border-radius:50%;object-fit:cover;background:#222}
.chips{display:flex;flex-wrap:wrap;gap:5px}
.chip{font-size:11px;padding:2px 8px;border-radius:999px;background:#1d2836;border:1px solid #27364a;color:#a9b8cb}
.card .foot{display:flex;gap:12px;font-size:11px;color:var(--dim);margin-top:auto}
.card .foot b{color:var(--gold);font-weight:700}

.tagbar{display:flex;flex-wrap:wrap;gap:6px;margin:4px 0 14px}
.tagbar .t{padding:6px 12px;border-radius:999px;border:1px solid var(--line);background:var(--card);color:var(--sub);font-size:12px;cursor:pointer;user-select:none}
.tagbar .t.on{background:linear-gradient(135deg,rgba(59,130,246,.28),rgba(139,92,246,.24));color:#fff;border-color:#3a5c8f}
.tagbar .group-label{width:100%;font-size:11px;color:var(--dim);margin:8px 0 0}
.filter-panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:12px;margin-bottom:14px}
.searchline{display:flex;gap:8px;margin-bottom:12px}
.searchline input{flex:1;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:11px 14px;color:var(--text);outline:none}
.btn{border:1px solid var(--line);background:var(--card);color:var(--text);border-radius:12px;padding:9px 16px;cursor:pointer;font-size:13px}
.btn.primary{background:linear-gradient(135deg,var(--brand),var(--brand2));border:0;color:#fff;font-weight:600}
.btn.ghost{background:transparent}
.btn:disabled{opacity:.5;cursor:not-allowed}

.space-head{background:linear-gradient(160deg,#1a2433,#121a24);border:1px solid var(--line);border-radius:20px;padding:18px;margin-bottom:14px}
.space-head h1{margin:0 0 8px;font-size:20px;line-height:1.35}
.space-head .desc{color:var(--sub);font-size:13px;white-space:pre-wrap;margin:6px 0 10px}
.space-head .author{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--sub)}
.space-head .author img{width:26px;height:26px;border-radius:50%}
.space-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.space-actions .btn{font-size:12px;padding:7px 14px}
.space-actions .btn.on{border-color:#3a5c8f;color:#cfe3ff;background:rgba(59,130,246,.15)}

.crumb{display:flex;flex-wrap:wrap;gap:6px;align-items:center;font-size:12px;color:var(--sub);margin:4px 0 10px}
.crumb a{color:#8ab4ff;cursor:pointer}
.crumb i{color:var(--dim);font-style:normal}

.toolrow{display:flex;align-items:center;gap:8px;margin:8px 0 10px;flex-wrap:wrap}
.toolrow .spacer{flex:1}
.toolrow select{background:var(--card);color:var(--text);border:1px solid var(--line);border-radius:10px;padding:7px 10px;outline:none}

.filelist{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.frow{display:flex;align-items:center;gap:12px;padding:12px 14px;border-bottom:1px solid rgba(36,48,64,.7);cursor:pointer}
.frow:last-child{border-bottom:0}
.frow:hover{background:#1a2431}
.ftype{width:36px;height:36px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:800;background:#1e2b3b;color:#9fc3ff;flex:0 0 auto;text-transform:uppercase}
.ftype.dir{background:#2a2417;color:var(--gold)}
.ftype.pdf{background:#2b1a1c;color:#ff8b8b}
.ftype.doc{background:#152a3f;color:#7db5ff}
.ftype.img{background:#1d2a1e;color:#8ddc9a}
.ftype.vid{background:#251d33;color:#c9a4ff}
.ftype.aud{background:#2a2318;color:#ffc46b}
.fmain{flex:1;min-width:0}
.fname{font-size:13.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.fsub{font-size:11px;color:var(--dim);margin-top:2px;display:flex;gap:10px;flex-wrap:wrap}
.fact{display:flex;gap:6px;flex:0 0 auto}
.act-btn{border:1px solid var(--line);background:#18222e;color:#b9c9dd;border-radius:9px;padding:6px 10px;font-size:12px;cursor:pointer}
.act-btn:hover{border-color:#3a5c8f;color:#fff}
.checkbox{width:20px;height:20px;border-radius:6px;border:1px solid #3a4a60;display:flex;align-items:center;justify-content:center;flex:0 0 auto}
.checkbox.on{background:var(--brand);border-color:var(--brand);color:#fff}

.hotrow{display:flex;align-items:center;gap:12px;padding:11px 14px;border-bottom:1px solid rgba(36,48,64,.7)}
.hotrow:last-child{border-bottom:0}
.rank{width:24px;font-weight:800;color:var(--dim);text-align:center}
.rank.top1{color:#ff6b6b}.rank.top2{color:#ffa94d}.rank.top3{color:#ffd43b}

.empty{padding:50px 20px;text-align:center;color:var(--dim);font-size:13px}
.loading{padding:24px;text-align:center;color:var(--dim)}
.skeleton{height:110px;border-radius:var(--radius);background:linear-gradient(90deg,#151d27 25%,#1e2937 37%,#151d27 63%);background-size:400% 100%;animation:sk 1.3s infinite}
@keyframes sk{0%{background-position:100% 0}100%{background-position:-100% 0}}

.modal{position:fixed;inset:0;background:rgba(4,7,10,.85);backdrop-filter:blur(6px);display:none;z-index:100;padding:20px}
.modal.open{display:flex;align-items:center;justify-content:center}
.modal-body{background:#0f1620;border:1px solid var(--line);border-radius:20px;max-width:1000px;width:100%;max-height:92vh;overflow:auto;padding:16px;box-shadow:var(--shadow)}
.modal-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:10px;position:sticky;top:0;background:#0f1620;padding-bottom:8px}
.modal-head h3{margin:0;font-size:16px}
.pv img{width:100%;max-width:820px;display:block;margin:0 auto 10px;border-radius:8px;background:#fff}
.pv .pg{text-align:center;color:var(--dim);font-size:11px;margin:4px 0 12px}

.toast{position:fixed;left:50%;bottom:96px;transform:translate(-50%,20px);background:#1d2836;border:1px solid #35507a;color:#fff;padding:10px 18px;border-radius:999px;font-size:13px;opacity:0;pointer-events:none;transition:.25s;z-index:200;max-width:86vw;text-align:center}
.toast.show{opacity:1;transform:translate(-50%,0)}

.tabbar{position:fixed;left:0;right:0;bottom:0;display:none;background:rgba(15,22,32,.95);backdrop-filter:blur(16px);border-top:1px solid var(--line);padding:6px 4px calc(6px + env(safe-area-inset-bottom));z-index:60}
.tabbar a{flex:1;text-align:center;color:var(--dim);font-size:10.5px;display:flex;flex-direction:column;gap:2px;padding:4px 0}
.tabbar a span{font-size:17px;line-height:1.1}
.tabbar a.active{color:#8ab4ff}

.form{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px;max-width:460px}
.form h3{margin:0 0 12px;font-size:15px}
.form label{font-size:12px;color:var(--sub);display:block;margin:10px 0 5px}
.form input{width:100%;background:#0e1520;border:1px solid var(--line);border-radius:10px;padding:11px 12px;color:var(--text);outline:none;font-size:16px}
.form .row{display:flex;gap:8px;align-items:center;margin-top:5px}
.form .row input{flex:1 1 auto;min-width:0;width:auto}
.form .btn{width:100%;margin-top:14px;padding:12px}
.form .row .btn{width:auto;flex:0 0 auto;margin-top:0;padding:11px 14px;white-space:nowrap}
.note{font-size:12px;color:var(--dim);line-height:1.7}

.profile{display:flex;align-items:center;gap:12px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px}
.profile img{width:52px;height:52px;border-radius:50%;object-fit:cover;background:#222}
.profile .nm{font-size:16px;font-weight:700}
.profile .sub{font-size:12px;color:var(--sub)}

.menu{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;margin-top:14px}
.menu a,.menu div{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;border-bottom:1px solid rgba(36,48,64,.7);font-size:13.5px;cursor:pointer}
.menu a:last-child,.menu div:last-child{border-bottom:0}
.menu small{color:var(--dim);font-size:11px}

.progress{height:8px;border-radius:99px;background:#1b2531;overflow:hidden;margin-top:8px}
.progress i{display:block;height:100%;background:linear-gradient(90deg,var(--brand),var(--brand2));width:0;transition:width .4s}

@media(max-width:860px){
  .tabs{display:none}
  .tabbar{display:flex}
  .brand-sub{display:none}
  .brand-name{font-size:13px}
  .searchbar{order:3;flex:1 0 100%;max-width:none;margin:0}
  .topbar{flex-wrap:wrap;gap:10px}
  main{padding:12px 12px 24px}
  .stats{grid-template-columns:repeat(2,1fr)}
  .grid{grid-template-columns:1fr}
  .card{padding:12px}
  .space-head{padding:14px}
  .frow{padding:11px 12px}
  .fact .dl{display:none}
  .modal{padding:8px}
  .modal-body{padding:12px;max-height:94vh}
}
@media(max-width:420px){
  .user-chip{max-width:90px;padding:7px 10px}
  .icon-btn{width:34px;height:34px}
  .logo{width:34px;height:34px}
}

/* ---------------- AI 助手 ---------------- */
.ai-fab{
  display:none;position:fixed;right:16px;bottom:88px;width:52px;height:52px;border-radius:50%;
  align-items:center;justify-content:center;z-index:70;
  background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;
  font-weight:800;font-size:15px;letter-spacing:.5px;
  box-shadow:0 8px 24px rgba(59,130,246,.45);
}
.ai-btn{background:linear-gradient(135deg,rgba(59,130,246,.22),rgba(139,92,246,.18));border-color:#3a5c8f;color:#dbe9ff}

.ai-wrap{display:flex;flex-direction:column;gap:10px;height:calc(100vh - 200px);min-height:420px}
.ai-head{display:flex;align-items:center;justify-content:space-between;gap:10px}
.ai-head .ai-title b{font-size:16px}
.ai-head .ai-title span{display:block;font-size:11px;color:var(--dim);margin-top:1px}
.ai-head .btn{font-size:12px;padding:7px 12px}
.ai-quick{display:flex;flex-wrap:wrap;gap:6px}
.ai-quick .t{padding:6px 12px;border-radius:999px;border:1px solid var(--line);background:var(--card);color:var(--sub);font-size:12px;cursor:pointer;user-select:none}
.ai-quick .t:hover{border-color:#3a5c8f;color:#fff}

.chat-log{flex:1;min-height:0;overflow-y:auto;display:flex;flex-direction:column;gap:12px;
  padding:14px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius)}
.ai-welcome{text-align:center;padding:34px 14px;color:var(--dim)}
.ai-welcome .ai-wt{font-size:15px;font-weight:700;color:var(--text);margin-bottom:8px}
.ai-welcome .ai-wd{font-size:12.5px;line-height:1.8;max-width:480px;margin:0 auto}

.msg{display:flex;gap:8px;align-items:flex-start;max-width:100%}
.msg.me{justify-content:flex-end}
.msg .avatar{width:30px;height:30px;border-radius:10px;flex:0 0 auto;
  background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;
  font-size:11px;font-weight:800;display:flex;align-items:center;justify-content:center}
.msg .bubble{background:#1b2531;border:1px solid var(--line);border-radius:14px;padding:10px 13px;
  font-size:13.5px;line-height:1.72;max-width:calc(100% - 44px);word-break:break-word}
.msg.me .bubble{background:linear-gradient(135deg,rgba(59,130,246,.28),rgba(139,92,246,.22));border-color:#3a5c8f;max-width:78%}
.msg .bubble.typing{color:var(--dim);font-size:13px}
.msg .bubble .li{display:block}
.msg .bubble .ref{color:#8ab4ff;font-weight:700}

.ai-recos{display:flex;flex-direction:column;gap:6px;margin-top:10px}
.reco{display:flex;align-items:center;gap:8px;padding:9px 10px;border:1px solid var(--line);border-radius:11px;background:#131b25}
.reco .rk{flex:0 0 auto;font-size:11px;font-weight:800;color:var(--gold)}
.reco .rm{flex:1;min-width:0}
.reco .rn{font-size:12.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.reco .rs{font-size:10.5px;color:var(--dim);margin-top:2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.reco .act-btn{padding:5px 9px;font-size:11px;flex:0 0 auto}

.chat-input{display:flex;gap:8px}
.chat-input input{flex:1;min-width:0;background:var(--card);border:1px solid var(--line);border-radius:12px;
  padding:12px 14px;color:var(--text);outline:none;font-size:15px}
.chat-input input::placeholder{color:var(--dim)}
.chat-input .btn{flex:0 0 auto;padding:0 18px}

.ai-md{font-size:13.5px;line-height:1.85}
.ai-md .li{display:block}

/* 分页 / 加载更多 / 最新标记 */
.pager{display:flex;align-items:center;justify-content:center;gap:10px;flex-wrap:wrap;margin:14px 0 6px;font-size:12px;color:var(--sub)}
.pager .btn{padding:7px 14px;font-size:12px}
.pager .pginfo b{color:var(--text)}
.pager .pgjump{display:flex;align-items:center;gap:6px}
.pager .pgjump input{width:76px;background:var(--card);border:1px solid var(--line);border-radius:9px;padding:6px 8px;color:var(--text);outline:none;font-size:12px}
.more-wrap{text-align:center;margin:14px 0 4px}
.more-wrap .btn{padding:9px 20px;font-size:12px}
.more-wrap .hint{font-size:11px;color:var(--dim)}
.newtag{display:inline-block;margin-left:6px;padding:0 5px;border-radius:5px;background:rgba(239,68,68,.16);border:1px solid rgba(239,68,68,.4);color:#ff8b8b;font-size:10px;line-height:16px;vertical-align:1px}
.ai-plan{font-size:11px;color:#8ab4ff;background:rgba(59,130,246,.12);border:1px solid rgba(59,130,246,.28);border-radius:8px;padding:4px 9px;margin-bottom:8px;display:inline-block}

@media(max-width:860px){
  .ai-fab{display:flex}
  .ai-wrap{height:calc(100vh - 245px);min-height:360px}
  .ai-quick{overflow-x:auto;flex-wrap:nowrap;padding-bottom:2px}
  .ai-quick .t{white-space:nowrap}
  .chat-log{padding:12px}
  .msg .bubble{max-width:calc(100% - 40px)}
  .msg.me .bubble{max-width:82%}
  .reco{gap:6px}
  .reco .act-btn{padding:5px 7px}
}